Pentagon releases official timeline of Benghazi attack

By the CNN Wire Staff

Updated 8:22 PM ET, Wed January 23, 2013

Photos: Attack on U.S. mission in Benghazi22 photos

Attack on U.S. mission in Benghazi – Attackers set the U.S. mission in Benghazi, Libya, on fire on September 11, 2012. The U.S. ambassador to Libya, Christopher Stevens, and three other U.S. nationals were killed during the attack. The Obama administration initially thought the attack was carried out by an angry mob responding to a video, made in the United States, that mocked Islam and the Prophet Mohammed. But the storming of the mission was later determined to have been a terrorist attack.

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Photos: Attack on U.S. mission in Benghazi22 photos

Attack on U.S. mission in Benghazi – Obama and Clinton stand at Andrews Air Force Base as the bodies of the four Americans killed are returned on September 14.

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Attack on U.S. mission in Benghazi – A desk sits inside the burnt U.S. mission on September 13, two days after the attack.

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Attack on U.S. mission in Benghazi – Damage is seen inside the U.S. mission on September 13.

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Attack on U.S. mission in Benghazi – A lounge chair and umbrella float in the swimming pool of the U.S. mission on September 13.

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Attack on U.S. mission in Benghazi – Demonstrators gather in Libya on September 12 to condemn the killers and voice support for the victims.

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Attack on U.S. mission in Benghazi – U.S. President Barack Obama, with Secretary of State Hillary Clinton on September 12, makes a statement at the White House about Stevens' death.

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Attack on U.S. mission in Benghazi – A burnt vehicle is seen at the U.S. mission in Benghazi on September 12.

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Attack on U.S. mission in Benghazi – People inspect the damage on September 12.

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Attack on U.S. mission in Benghazi – A small American flag is seen in the rubble on September 12.

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Attack on U.S. mission in Benghazi – A man stands in part of a burned-out building of the U.S. mission on September 12.

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Attack on U.S. mission in Benghazi – Smoke and fire damage is evident inside a building on September 12.

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Attack on U.S. mission in Benghazi – Half-burnt debris and ash cover the floor of one of the U.S. mission buildings on September 12.

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Attack on U.S. mission in Benghazi – The U.S. mission is seen in flames on September 11, the day of the attack.

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Attack on U.S. mission in Benghazi – A protester reacts as the U.S. mission burns on September 11.

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Attack on U.S. mission in Benghazi – A vehicle and the surrounding area are engulfed in flames on September 11.

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Attack on U.S. mission in Benghazi – Flames erupt outside of a building on September 11.

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Attack on U.S. mission in Benghazi – A vehicle burns during the attack on the U.S. mission on September 11.

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Attack on U.S. mission in Benghazi – Onlookers record the damage from the attack on September 11.

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Attack on U.S. mission in Benghazi – Onlookers walk past a burning truck and building on September 11.

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Attack on U.S. mission in Benghazi – A vehicle sits smoldering in flames on September 11.

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Attack on U.S. mission in Benghazi – People duck flames outside a building on September 11.

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The Pentagon released Friday an hour-by-hour timeline of the September 11 assault on the U.S. Consulate in Benghazi, Libya, highlighting when Defense Secretary Leon Panetta and senior commanders were informed of the attack and when decisions were made to move forces to assist. The release comes as the Obama administration is facing increasing questions over its response to the attack.

9:59 p.m. -- A surveillance drone is directed to fly over the U.S. compound, but it is unarmed.

10:32 p.m. -- The Office of the Secretary Defense and the Joint Staff are notified of the attack by the National Military Command Center at the Pentagon. "The information is quickly passed to Secretary Panetta and General Dempsey."

11 p.m. -- Panetta and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey meet with President Obama at the White House where they discuss the unfolding situation and how to respond. The meeting had been previously scheduled.

11:30 p.m. -- All surviving U.S. personnel are evacuated from the consulate. U.S. Ambassador Chris Stevens and State Department computer expert Sean Smith were killed in the initial assault.

September 12

Midnight to 2 a.m. -- Panetta and other senior leaders discuss possible options for further violence if it were to break out. Panetta gives verbal orders for Marine anti-terrorist teams from Rota, Spain, to prepare to deploy to Tripoli and Benghazi. Panetta also orders a special operations force team training in Croatia and an additional special operations force team in the United States to prepare to deploy to a staging base in southern Italy.

1:30 a.m. -- A six-man security team from the U.S. Embassy in Tripoli arrives in Benghazi.

2:39 a.m. to 2:53 a.m. -- The National Military Command Center gives formal authorization for the deployment of the two special operations force teams from Croatia and the United States.

5:15 a.m. -- Attackers launch assault on a second U.S. facility in Benghazi. Two former U.S. Navy SEALs acting as security contractors are killed. They are identified as Tyrone Woods and Glen Doherty.

6:05 a.m. -- A C-17 aircraft in Germany is told to prepare to deploy to Libya to evacuate the consulate personnel.

7:40 a.m. -- The first wave of Americans are evacuated to Tripoli via airplane.

10 a.m. -- A second group, including those killed in the attack, are flown to Tripoli.

2:15 p.m. -- The C-17 departs from Germany for the flight to Tripoli.

7:17 p.m. -- The C-17 leaves Tripoli with the American consulate personnel and the bodies of Stevens, Smith, Woods and Doherty.

7:57 p.m. -- The U.S. special operations force team based in Croatia arrives at a staging base in Italy.

8:56 p.m. -- One of the Marine anti-terrorist teams from Spain arrives in Tripoli.

9:28 p.m. -- The U.S.-based special operations force team arrives at its staging base in Italy.

A testy exchange erupted between Sen. John McCain and Joint Chiefs Chairman Gen. Martin Dempsey during the latter's testimony about September's deadly attack on the U.S. diplomatic mission in Benghazi, Libya.